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<title>The obsolete initialization function</title>
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<div class="titlepage"><div><div><h3 class="title">
<a name="boost_test.adv_scenarios.obsolete_init_func"></a><a class="link" href="obsolete_init_func.html" title="The obsolete initialization function">The obsolete
      initialization function</a>
</h3></div></div></div>
<p>
        For backwards compatibility, the <span class="emphasis"><em>Unit Test Framework</em></span>
        also allows the customization of an initialization function of a different
        type. This is called the <span class="emphasis"><em>obsolete initialization function</em></span>.
        Its signature is:
      </p>
<pre class="programlisting"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">unit_test</span><span class="special">::</span><span class="identifier">test_suite</span><span class="special">*</span> <span class="identifier">init_unit_test_suite</span><span class="special">(</span><span class="keyword">int</span> <span class="identifier">argc</span><span class="special">,</span> <span class="keyword">char</span><span class="special">*</span> <span class="identifier">argv</span><span class="special">[]);</span>
</pre>
<p>
        The original design of the <span class="emphasis"><em>Unit Test Framework</em></span> required
        of the programmer to implement it. It was intended to initialize and return
        the <a class="link" href="../tests_organization/test_tree/master_test_suite.html" title="Master test suite">master
        test suite</a>. No <a class="link" href="../tests_organization/test_cases/test_organization_nullary.html#ref_BOOST_AUTO_TEST_CASE">automatic
        test case registration</a> was available at that time. The null-pointer
        value was considered an initialization error.
      </p>
<p>
        In the header-only usage variant, you fall back to the obsolete initialization
        function signature by omitting the definition of macro <a class="link" href="../utf_reference/link_references/link_boost_test_alternative_init_macro.html" title="BOOST_TEST_ALTERNATIVE_INIT_API"><code class="computeroutput"><span class="identifier">BOOST_TEST_ALTERNATIVE_INIT_API</span></code></a>
        in test module code.
      </p>
<h6>
<a name="boost_test.adv_scenarios.obsolete_init_func.h0"></a>
        <span class="phrase"><a name="boost_test.adv_scenarios.obsolete_init_func.example_descr"></a></span><a class="link" href="obsolete_init_func.html#boost_test.adv_scenarios.obsolete_init_func.example_descr">Example:
        using obsolete initialization function</a>
      </h6>
<div class="informaltable"><table class="table">
<colgroup><col></colgroup>
<thead><tr><th>
                <p>
                  Code
                </p>
              </th></tr></thead>
<tbody><tr><td>
<pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">test</span><span class="special">/</span><span class="identifier">included</span><span class="special">/</span><span class="identifier">unit_test</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">iostream</span><span class="special">&gt;</span>

<span class="identifier">BOOST_AUTO_TEST_CASE</span><span class="special">(</span><span class="identifier">test1</span><span class="special">)</span>
<span class="special">{</span>
  <span class="identifier">BOOST_TEST</span><span class="special">(</span><span class="keyword">false</span><span class="special">);</span>
<span class="special">}</span>

<span class="identifier">boost</span><span class="special">::</span><span class="identifier">unit_test</span><span class="special">::</span><span class="identifier">test_suite</span><span class="special">*</span> <span class="identifier">init_unit_test_suite</span><span class="special">(</span><span class="keyword">int</span> <span class="comment">/*argc*/</span><span class="special">,</span> <span class="keyword">char</span><span class="special">*</span> <span class="comment">/*argv*/</span><span class="special">[])</span>
<span class="special">{</span>
  <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="string">"using obsolete init"</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
  <span class="keyword">return</span> <span class="number">0</span><span class="special">;</span>
<span class="special">}</span>
</pre>
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                <p>
                  Output
                </p>
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<pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="special">&gt;</span> <span class="identifier">custom_obsolete_init</span>
<span class="keyword">using</span> <span class="identifier">obsolete</span> <span class="identifier">init</span>
<span class="identifier">Running</span> <span class="number">1</span> <span class="identifier">test</span> <span class="keyword">case</span><span class="special">...</span>
<span class="identifier">test</span><span class="special">.</span><span class="identifier">cpp</span><span class="special">(</span><span class="number">6</span><span class="special">):</span> <span class="identifier">error</span><span class="special">:</span> <span class="identifier">in</span> <span class="string">"test1"</span><span class="special">:</span> <span class="identifier">check</span> <span class="keyword">false</span> <span class="identifier">has</span> <span class="identifier">failed</span>

<span class="special">***</span> <span class="number">1</span> <span class="identifier">failure</span> <span class="identifier">is</span> <span class="identifier">detected</span> <span class="identifier">in</span> <span class="identifier">the</span> <span class="identifier">test</span> <span class="identifier">module</span> <span class="string">"Master Test Suite"</span>
</pre>
              </td></tr></tbody>
</table></div>
<p>
        In the static-library usage variant, you need to omit the definition of macro
        <a class="link" href="../utf_reference/link_references/link_boost_test_alternative_init_macro.html" title="BOOST_TEST_ALTERNATIVE_INIT_API"><code class="computeroutput"><span class="identifier">BOOST_TEST_ALTERNATIVE_INIT_API</span></code></a>
        in test module and compile the <span class="emphasis"><em>Unit Test Framework</em></span> static
        library without the compilation flag <a class="link" href="../utf_reference/link_references/link_boost_test_alternative_init_macro.html" title="BOOST_TEST_ALTERNATIVE_INIT_API"><code class="computeroutput"><span class="identifier">BOOST_TEST_ALTERNATIVE_INIT_API</span></code></a>
        (this is the default).
      </p>
<p>
        In the shared-library usage variant, it is not possible to use the obsolete
        initialization function.
      </p>
<p>
        Even if you decide to us the obsolete initialization function, it is recommended
        that:
      </p>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
            You always return a null-pointer value and install the master test suite
            via <code class="computeroutput"><a class="link" href="../../boost/unit_test/test_suite.html#idm44970733617744-bb">test_suite::add</a></code> as illustrated <a class="link" href="../tests_organization/test_cases/test_organization_nullary.html#ref_BOOST_TEST_CASE">here</a>. The current framework does
            no longer treat the null-pointer value as failure.
          </li>
<li class="listitem">
            You signal the failure by throwing <code class="computeroutput"><a class="link" href="../../boost/unit_test/framework/setup_error.html" title="Struct setup_error">boost::unit_test::framework::setup_error</a></code>
            exception.
          </li>
<li class="listitem">
            You access the command-line arguments through the interface of the <a class="link" href="../tests_organization/test_tree/master_test_suite.html" title="Master test suite">master
            test suite</a>, and ignore the function's arguments <code class="computeroutput"><span class="identifier">argc</span></code> and <code class="computeroutput"><span class="identifier">argv</span></code>.
          </li>
</ol></div>
<div class="caution"><table border="0" summary="Caution">
<tr>
<td rowspan="2" align="center" valign="top" width="25"><img alt="[Caution]" src="../../../../../../doc/src/images/caution.png"></td>
<th align="left">Caution</th>
</tr>
<tr><td align="left" valign="top"><p>
          The obsolete initialization function is deprecated as its name indicates.
          It is recommended to migrate to the new API, and rely on the automated
          test unit registration and <a class="link" href="../tests_organization/fixtures.html" title="Fixtures">fixtures</a>
          (including <a class="link" href="../tests_organization/fixtures/global.html" title="Global fixture">global
          fixtures</a>) for other set-up.
        </p></td></tr>
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<td align="right"><div class="copyright-footer">Copyright © 2001-2020 Boost.Test contributors<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
      </p>
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